Gruetzemacher -- a training partner of World Extreme Cagefighting
lightweight champion Benson
Henderson at the MMA Lab in Glendale, Ariz. -- has posted four
consecutive victories since his 25-second submission loss to
Joe
Cronin in February 2009. The 24-year-old last appeared at Rage
in the Cage 140 in March, when he stopped Nadeem
Al-Hassan on first-round punches.

Anchored at Arizona Combat Sports, Diaz has not competed since his
knockout loss to Reuben
Duran at a King of the Cage show in February. The well-traveled
31-year-old has tested his skills against a number of highly
regarded fighters, including world-ranked flyweight Mamoru
Yamaguchi, former UFC lightweight title contender Hermes
Franca and 2009 Dream featherweight grand prix quarter-finalist
Abel
Cullum. Diaz has secured 10 of his 13 career victories by
submission.